Microsaccades

The sixth category of movements is called microsaccades, which are small, involuntary jerks of less than one degree that trace out an erratic path. They are believed to augment many other processes, including control of fixations, reduction of perceptual fading due to adaptation, improvement of visual acuity, and resolving perceptual ambiguities [273]. Although these motions have been known since the 18th century [54], their behavior is extremely complex and not fully understood. Microsaccades are an active topic of research in perceptual psychology, biology, and neuroscience.